From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/kernel/trace/trace_functions.c | 32 +++++++++++++++++++-------------
1 files changed, 19 insertions(+), 13 deletions(-)
diff --git a/kernel/kernel/trace/trace_functions.c b/kernel/kernel/trace/trace_functions.c
index 4e8acfe..93e20ed 100644
--- a/kernel/kernel/trace/trace_functions.c
+++ b/kernel/kernel/trace/trace_functions.c
@@ -34,29 +34,37 @@
TRACE_FUNC_OPT_STACK = 0x1,
};
-static int allocate_ftrace_ops(struct trace_array *tr)
+int ftrace_allocate_ftrace_ops(struct trace_array *tr)
{
struct ftrace_ops *ops;
+
+ /* The top level array uses the "global_ops" */
+ if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
+ return 0;
ops = kzalloc(sizeof(*ops), GFP_KERNEL);
if (!ops)
return -ENOMEM;
- /* Currently only the non stack verision is supported */
+ /* Currently only the non stack version is supported */
ops->func = function_trace_call;
ops->flags = FTRACE_OPS_FL_RECURSION_SAFE | FTRACE_OPS_FL_PID;
tr->ops = ops;
ops->private = tr;
+
return 0;
}
+void ftrace_free_ftrace_ops(struct trace_array *tr)
+{
+ kfree(tr->ops);
+ tr->ops = NULL;
+}
int ftrace_create_function_files(struct trace_array *tr,
struct dentry *parent)
{
- int ret;
-
/*
* The top level array uses the "global_ops", and the files are
* created on boot up.
@@ -64,9 +72,8 @@
if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
return 0;
- ret = allocate_ftrace_ops(tr);
- if (ret)
- return ret;
+ if (!tr->ops)
+ return -EINVAL;
ftrace_create_filter_files(tr->ops, parent);
@@ -76,8 +83,7 @@
void ftrace_destroy_function_files(struct trace_array *tr)
{
ftrace_destroy_filter_files(tr->ops);
- kfree(tr->ops);
- tr->ops = NULL;
+ ftrace_free_ftrace_ops(tr);
}
static int function_trace_init(struct trace_array *tr)
@@ -101,7 +107,7 @@
ftrace_init_array_ops(tr, func);
- tr->trace_buffer.cpu = get_cpu();
+ tr->array_buffer.cpu = get_cpu();
put_cpu();
tracing_start_cmdline_record();
@@ -118,7 +124,7 @@
static void function_trace_start(struct trace_array *tr)
{
- tracing_reset_online_cpus(&tr->trace_buffer);
+ tracing_reset_online_cpus(&tr->array_buffer);
}
static void
@@ -143,7 +149,7 @@
goto out;
cpu = smp_processor_id();
- data = per_cpu_ptr(tr->trace_buffer.data, cpu);
+ data = per_cpu_ptr(tr->array_buffer.data, cpu);
if (!atomic_read(&data->disabled)) {
local_save_flags(flags);
trace_function(tr, ip, parent_ip, flags, pc);
@@ -192,7 +198,7 @@
*/
local_irq_save(flags);
cpu = raw_smp_processor_id();
- data = per_cpu_ptr(tr->trace_buffer.data, cpu);
+ data = per_cpu_ptr(tr->array_buffer.data, cpu);
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1)) {
--
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